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Re: [Qemu-block] [PATCH v11 04/10] block: introduce BDRV_REQ_ALLOCATE fl

From: Alberto Garcia
Subject: Re: [Qemu-block] [PATCH v11 04/10] block: introduce BDRV_REQ_ALLOCATE flag
Date: Mon, 07 Jan 2019 15:22:50 +0100
User-agent: Notmuch/0.18.2 (http://notmuchmail.org) Emacs/24.4.1 (i586-pc-linux-gnu)

On Tue 18 Dec 2018 08:57:36 AM CET, Anton Nefedov wrote:
> The flag is supposed to indicate that the region of the disk image has
> to be sufficiently allocated so it reads as zeroes.
> The call with the flag set must return -ENOTSUP if allocation cannot
> be done efficiently.
> This has to be made sure of by both
>   - the drivers that support the flag
>   - and the common block layer (so it will not fall back to any slowpath
>     (like writing zero buffers) in case the driver does not support
>     the flag).
> Signed-off-by: Anton Nefedov <address@hidden>

Reviewed-by: Alberto Garcia <address@hidden>


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